Digital Identity is Not an Emerging Technology

I proposed doing a tutorial on digital identity management protocols (SAML, SMPL, XACML, WS-Security, etc.) at the O'Reilly Emerging Tech conference next year. Just got notice that they didn't accept the proposal. I was planning on doing an expanded version of the tutorial I did at DIDW, but with more meat concerning the protocols and their implementation. I guess digital identity is not cutting edge enough for ETCon? Go figure.